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Author Topic: Very low output power & connection speed  (Read 8091 times)

Admacp

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Very low output power & connection speed
« on: September 23, 2009, 09:25:28 PM »

I have been taking note of my router stats over the last few times when re-syncing my Home Hub 2 router and seem to be seeing a pattern with my low output power giving low connection speeds.
I have re-synced the router 6 times over the last 3 weeks to see if I can improve my current connection to that which I used to get.

1st resync connection was 1184/416 with output power of 1.9dBm/0.9dBm. (noise margin 12.5/6.0)
2nd resync was 1152/448 with output power of 1.9dBm/0.9dBm (tested straight out of BT test socket). (noise margin 12.7/7.0)
3rd resync was 1344/448 with output power of 2.1dBm/0.9dBm (tested straight out of BT test socket with a different adsl filter). (noise margin 13.1/6.0)
4th resync was 1248/416 with output power of 2.0dBm/0.9dBm (tested straight out of BT test socket with the different adsl filter). (noise margin 13.2/6.0)
5th resync was 1056/448 with output power of 1.8dBm/0.9dBm (tested straight out of BT test socket with the different adsl filter). (noise margin 15.9/6.0)
6th resync was 1024/448 with output power of 1.7dBm/0.9dBm (tested straight out of BT test socket with the different adsl filter). (noise margin 13.0/6.0) (4 days 53mins ago)

There seems to be a pattern here. What sets the output power and is it adjustable? I used to have a steady connection of 1856 (IP profile of 1500) until one morning I noticed very slow speeds and started switching off now and again at random times of day to see if I could get the connection rate to improve.
Current stats are as follows:
Line state Connected
Connection time 4 days, 00:53:42
Downstream 1,024 Kbps
Upstream 448 Kbps
 
 
ADSL Settings
VPI/VCI 0/38
Type PPPoA
Modulation G.992.1 Annex A
Latency type Interleaved
Noise margin (Down/Up) 10.0 dB / 6.0 dB
Line attenuation (Down/Up) 66.7 dB / 31.5 dB
Output power (Down/Up) 1.7 dBm / 0.9 dBm
Loss of Framing (Local/Remote) 0 / 0
Loss of Signal (Local/Remote) 0 / 0
Loss of Power (Local/Remote) 0 / 0
FEC Errors (Down/Up) 6035 / 863
CRC Errors (Down/Up) 89 / 390
HEC Errors (Down/Up) 231 / 290
Error Seconds (Local/Remote) 52 / 187

My previous router (Belkin 7632 ver. 8) used to report very low output figures as well. Strangel my line attenuation figures have changed slightly as well (67.3/31.5, 66.5/31.5, 66.8/31.5, 67.2/31.5, 66.7/31.5!)
 
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Oranged

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Re: Very low output power & connection speed
« Reply #1 on: September 24, 2009, 08:49:59 AM »

I have never seen such low output power data for both downstream and upstream. The other data in the router stats looks OK and as you've tried from the test socket and with a new filter the problem almost certainly lies in your local exchange.

You should contact your ISP giving them the data that you've collected.
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HPsauce

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Re: Very low output power & connection speed
« Reply #2 on: September 24, 2009, 08:58:39 AM »

Are you sure it's not just mis-reporting by a factor of 10? There are plenty of firmware bugs around like that.

Do a sense check and plug your phone number and postcode into the line checker here or at SamKnows and see what speed estimates you get.
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jeffbb

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Re: Very low output power & connection speed
« Reply #3 on: September 24, 2009, 09:35:13 AM »

Hi
you have avery HIGH attenuation
Line attenuation (Down/Up) 66.7 dB / 31.5 dB

most routers repor max 0f 63.5

Downstream 1,024 Kbps

with attenuation of 67 you could expect 1280Kbps and aline length of at least 4.9 Km. unfortunately cannot give figures for more attenuation. . So you are doing well for your line .see link below
http://www.kitz.co.uk/adsl/max_speed_calc.php


the power output is almost certainly an error in reporting

The only other comment is that it looks as if your target SNR has been raised  see link below
http://www.kitz.co.uk/adsl/linestats.htm#SNR
regards Jeff
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